Bog off idle

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Hi all, currently i have this bog off idle and it only happens when the engine is very hot. Everytime i upshift, and open the throttle slightly from 0-1/8 the flat spot kicks in. It does not happen if i open the throttle more. Any help is appreciated. TIA!

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Hi Eddie, red needle 4th clip was what i was using before switching to blue but i had lots of excessive popping on decel. I'm gonna use some of that chamber seal i bought from TT to seal the header pipe and mid pipe joints and try red needle again and report back if there's any improvement. While i'm at it, i'm gonna use duct tape to close up the 4X3 back to 3x3 too. Do you think an inch more on the airbox coupled with my hi flo K&N mightbe the cause of excessive popping on decel. I don't get this much with the blue needle but the bog off idle really annoys me.